718549621 has 2 divisors, whose sum is σ = 718549622. Its totient is φ = 718549620.

The previous prime is 718549577. The next prime is 718549631. The reversal of 718549621 is 126945817.

718549621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391446225 + 327103396 = 19785^2 + 18086^2 .

It is a cyclic number.

It is not a de Polignac number, because 718549621 - 2²⁹ = 181678709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (718549631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359274810 + 359274811.

It is an arithmetic number, because the mean of its divisors is an integer number (359274811).

Almost surely, 2^718549621 is an apocalyptic number.

It is an amenable number.

718549621 is a deficient number, since it is larger than the sum of its proper divisors (1).

718549621 is an equidigital number, since it uses as much as digits as its factorization.

718549621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 718549621 is about 26805.7758887893. The cubic root of 718549621 is about 895.6787174027.

The spelling of 718549621 in words is "seven hundred eighteen million, five hundred forty-nine thousand, six hundred twenty-one".